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Powering old digital backs in the field

If I may borrow on the collective knowledge here, and beg your patience while I ask you to think back over a decade or so...

I'm baby-stepping my way into using my Actus with a larger format back (had been using Sony E). I've upgraded the Actus, bought a gently used Aptus 75, and am in the process of acquiring the camera cable and transitioning my three most-used lenses for the Rollei electronic shutter system. I know I'm going to end up with an external battery to power the Lens Control S, so my thought was that it would be really nice to have a battery with two DC outputs to power both the control and the back.

I found one that has a 12v output, perfect for the LCS, and a 20v/3A output. Is 20v too much for a digital back? If so, I can easily build a DC to DC cable with an in-line reducer to 12v, but is that enough power? I've read some backs use closer to 19v when they're plugged into the firewire port of a tower.

Alternately, if you know of a battery with two DC outputs that will work without any in-line conditioning, please let me know.

Thanks in advance.

Brad
 
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